std::is_array
From Cppreference
| Defined in header <type_traits>
| ||
| template< class T >
struct is_array; | (since C++11) | |
If T is an array type, provides the member constant value equal true. For any other type, value is false.
Contents |
Inherited from std::integral_constant
Member constants
| value [static] | true if T is an array type , false otherwise (public static member constant) |
Member functions
| operator bool | converts the object to bool, returns value (public member function) |
Member types
| Type | Definition |
| value_type | bool |
| type | std::integral_constant<bool, value> |
[edit] Equivalent definition
template<class T> struct is_array : std::false_type {}; template<class T> struct is_array<T[]> : std::true_type {}; template<class T, std::size_t N> struct is_array<T[N]> : std::true_type {}; |
[edit] Example
#include <iostream> #include <type_traits> class A {}; int main() { std::cout << std::boolalpha; std::cout << std::is_array<A>::value << '\n'; std::cout << std::is_array<A[3]>::value << '\n'; std::cout << std::is_array<float>::value << '\n'; std::cout << std::is_array<int>::value << '\n'; std::cout << std::is_array<int[3]>::value << '\n'; }
Output:
false true false false true
[edit] See also
| (C++11) | obtains the number of dimensions of an array type (class template) |
| (C++11) | obtains the size of an array type along a specified dimension (class template) |
| (C++11) | removes one extent from the given array type (class template) |
| (C++11) | removes all extents from the given array type (class template) |
